Plain English Meaning

Following an invisible line in the sky that points to or from a VOR ground station, by adjusting your heading to keep a needle on the instrument centered.

Full Definition

The procedure of flying a desired course to or from a VOR (Very High Frequency Omnidirectional Range) ground station by keeping the Course Deviation Indicator (CDI) needle centered on a selected radial. The pilot tunes the VOR frequency, identifies the station, selects the desired course on the Omnibearing Selector (OBS), and then makes small heading corrections to keep the needle centered, which means the aircraft is on the chosen course. is applied by establishing a heading that offsets while the needle remains centered.